I, too, have been hiring providers since I was about 30. Always my age or younger at that time. I am in my mid-60's and I still prefer younger, twink type guys. Maybe it's because I started with other guys when I was in my teens. In any case I rarely have been turned down because of my age. My experience has been that most young providers like to meet someone who is settled in their home, can turn them on to food they've never tried or music from our time that they've not heard before, etc.
I met a 23 yo provider who has only been at it for a few months and who was all over me as soon as he saw me. I've been at this long enough to know it was not just the $ in this case but his attraction to a friendly, nice, older man in decent physical shape. The "Daddy" effect maybe? Although he was dominant and I was more than happy to accommodate him in that role.